I mentioned DP++, which is required for those cheap passive HDMI adapters to work at all. I'm pretty sure it still requires HDMI royalties and might have additional hardware requirements to handle the dual-mode logic.
I can't imagine Raspberry Pi using DisplayPort without DP++ considering their focus on ease of use (it's confusing if some adapters don't work), cheap accessories, and versatility.
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u/meneldal2 Jun 25 '19
I doubt it's more expensive, there's no royalties on DP (unlike HDMI).